MMM 2022

November 07, 2022

Minneapolis, United States

Observation of unidirectional spin Hall magnetoresistance in amorphous PtSn4/CoFeB bilayers

Unidirectional spin Hall magnetoresistance (USMR) is a magnetoresistance effect with potential applications to read two-terminal spin-orbit-torque (SOT) devices directly. In this work, we observed a large USMR value (up to 0.710-11 per A/cm2, 50% larger than reported values from heavy metals) in sputtered amorphous PtSn4/CoFeB bilayers. Ta/CoFeB bilayers with interfacial MgO insertion layers are deposited as control samples. The control experiments show that increasing the interfacial resistance can increase the USMR value, which is the case in PtSn4/CoFeB bilayers. The observation of a large USMR value in an amorphous spin-orbit-torque material has provided an alternative pathway for USMR application in two-terminal SOT devices.

Next from MMM 2022


Dependence of TMR and RA on Fe insertion layer thickness in MTJs using L10 (MnCo)Al electrode and MgAl2O4 insulating layer

MMM 2022

Ryutaro Kikuchi and 3 other authors

07 November 2022

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